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Seismic hazard disaggregation in performance‐based earthquake engineering: occurrence or exceedance? |
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| Authors: | Matthew J Fox Peter J Stafford Timothy J Sullivan |
| Institution: | 1. UME School, IUSS Pavia, Pavia, Italy;2. Department of Civil and Environmental Engineering, Imperial College London, London, U.K.;3. Department of Civil Engineering and Architecture, University of Pavia, Pavia, Italy;4. EUCENTRE, Pavia, Italy |
| Abstract: | Seismic hazard disaggregation is commonly used as an aid in ground‐motion selection for the seismic response analysis of structures. This short communication investigates two different approaches to disaggregation related to the exceedance and occurrence of a particular intensity. The impact the different approaches might have on a subsequent structural analysis at a given intensity is explored through the calculation of conditional spectra. It is found that the exceedance approach results in conditional spectra that will be conservative when used as targets for ground‐motion selection. It is however argued that the use of the occurrence disaggregation is more consistent with the objectives of seismic response analyses in the context of performance‐based earthquake engineering. Copyright © 2015 John Wiley & Sons, Ltd. |
| Keywords: | seismic hazard disaggregation seismic hazard deaggregation ground‐motion selection performance‐based earthquake engineering conditional spectrum |